Improvements to the WASM App

[mwestphal]

Related to https://github.com/f3d-app/f3d/issues/1252 but specific to the WASM app visible at https://f3d.app/viewer

• [ ] : Support drag and drop
• [ ] : Right click context menu should be disabled when clicking on the 3D canvas
• [ ] : When leaving the canvas while interacting, the current interaction is not stopped
• [x] : Add link to github repository
• [x] : Add link to https://f3d.app
• [x] : Add visible license and copyright
• [x] : Put canvas on the whole page to avoid cutoff of the grid and mesh
• [x] : Add model url parsing feature: https://github.com/f3d-app/f3d/issues/1604
• [ ] : Add a console
• [ ] : Add animation controls